/**
 * #      1391
 * 名称   检查网格中是否存在有效路径
 * 链接   https://leetcode-cn.com/problems/check-if-there-is-a-valid-path-in-a-grid
 * 题解   [181](https://leetcode-cn.com/problems/check-if-there-is-a-valid-path-in-a-grid/solution)
 * 通过率 39.2%
 * 难道   中等
 */

